1. Vacuum pump of the truck makes tank body generate negative pressure and positivepressure, and ensures suction and pressure discharge functions.2. High pressure plunger pump generates high pressure water jet, makes the nozzle generate reaction force andadvance in pipe.3. Powerful dredging function on blockage material in pipe, and can wash pipe and clean pipe wall effectively. 4. The truck has various features such as low working negative pressure, high volume efficiency, large suction depth, quick loading and unloading speed and large washing and dredging action force. 5. All movements of the truck uses hydraulic drive, this makes its structure more simple and compact and control system reliable, so the truck is typical product of mechanic, electric and hydraulic combination.